Christmas tree



FIG. 1 is a right perspective view of a Christmas tree showing our new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right back perspective view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left back perspective view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is another right perspective thereof shown in a used condition.

In the drawings, the broken lines in FIG. 8 depict portions of the design that form no part of the claim. 

The ornamental design for a Christmas tree, as shown and described. 